The pointer-dereference-postincrement example:

;*a++ = *b++;
	mov	r0,_a
	mov	r1,_b
	mov	ar2,@r1
	inc	_b
	mov	@r0,ar2
	inc	_a
	ret
;------------------------------------------------------------
;*a = *b;
	mov	r0,_a
	mov	r1,_b
	mov	ar2,@r1
	mov	@r0,ar2
;++a;
	inc	_a
;++b;
	inc	_b
	ret

The loop example:

;somechar = 10;
	mov	_somechar,#0x0A
;while(somechar-- != 0) {
00101$:	r2,_somechar
	dec	_somechar
	cjne	r2,#0x00,00108$
	ret
; i++; // this is the DOSOMETHING :-) (some body of the loop)
00108$:	inc	_i
	sjmp	00101$
;}
;------------------------------------------------------------
;somechar = 10;
	mov	_somechar,#0x0A
;do {
;  i++;  // DOSOMETHING
00101$:	inc	_i
;while(--somechar != 0);
	dec	_somechar
	mov	a,_somechar
	jz	00108$
	sjmp	00101$
00108$:	ret

SDCC is Version 2.6.1 #4478 (Nov 23 2006), run with no explicit commandline argument; examples compiled without any explicit pragma.

JW